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Surname Seydel (Seydel
, Зейдель
, سيديل) , globally, is quite a rare family name. The cognomen Seydel is habitual in Germany, where it is quite a rare surname, Switzerland, where it is a rare surname, and Turkey. Not in comparison with a country's population, it is the most numerous in Germany, the United States, and Turkey. Much less frequently, Seydel is the forename as well as the last name.